Berry Linux supports the Overlay File System from 0.51. (This means that you can WRITE some software on the BERRY CD-ROM)

Berry Linux can boot from USB-HDD/Key from 0.50.

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What’s Berry Linux ?

Berry Linux is a bootable CD that features, automatic hardware detection. It supports many graphics cards, sound cards, SCSI, USB, and other peripherals. If you have network devices, DHCP is auto-configured so you can use the Internet.
You can enjoy OpenOffice, the MS Office compatible office suite. The GIMP can be used to edit pictures and is included in Berry Linux.
Berry Linux can be used as a Linux demo, Educational CD, or a rescue system. Because it is a bootable CD, you can try it out without touching your hard drive. If you like it, there is an option to install Berry Linux on your hard disk. (Needs 1.7GB of free space. Using the Berry Linux Installer) Berry Linux is based on Red Hat Fedora.